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Stabilizing Liquids Using Interfacial Supramolecular Polymerization.

Pei-Yang Gu1,2, Yu Chai2,3, Honghao Hou2

  • 1College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation, Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China.

Angewandte Chemie (International Ed. in English)
|July 30, 2019
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Summary
This summary is machine-generated.

Researchers created a novel supramolecular polymer surfactant (SPS) using electrostatic interactions at oil-water interfaces. This surfactant enables the kinetic trapping of liquids in unusual, non-equilibrium shapes by jamming at the interface.

Keywords:
in situ AFMinterface assemblyporphyrinsstructure liquidsupramolecular polymers

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Surface science

Background:

  • The oil-water interface is crucial for many chemical and biological processes.
  • Stabilizing non-equilibrium liquid shapes is a significant challenge in fluid dynamics and materials science.

Purpose of the Study:

  • To investigate the formation of supramolecular polymer surfactants (SPSs) at the oil-water interface.
  • To explore the potential of these SPSs for stabilizing liquids in non-equilibrium shapes.

Main Methods:

  • Utilizing electrostatic interactions between 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (H6TPPS) in water and an amine-terminated hydrophobic polymer in oil.
  • Employing in situ real-space atomic force microscopy (AFM) for interface imaging.
  • Compressing the resulting elastic film to observe its mechanical response.

Main Results:

  • Strong electrostatic interactions formed a stable supramolecular polymer surfactant (SPS) of H6TPPS at the oil-water interface.
  • The SPS exhibited strong binding energy, allowing intermolecular aggregation.
  • AFM confirmed the presence and aggregation of SPSs at the interface.
  • The jamming of these aggregates at the interface enabled kinetic trapping of liquids.
  • The resulting elastic film showed wrinkling upon compression, demonstrating its ability to stabilize non-equilibrium shapes.

Conclusions:

  • A novel method for creating supramolecular polymer surfactants (SPSs) at oil-water interfaces was demonstrated.
  • These SPSs can jam and form elastic films capable of stabilizing liquids in kinetically trapped, non-equilibrium shapes.
  • This work opens new avenues for controlling liquid interfaces and creating advanced materials.